PRESERVED RIGHT-VENTRICULAR EJECTION FRACTION PREDICTS EXERCISE CAPACITY AND SURVIVAL IN ADVANCED HEART-FAILURE

Objectives. This study was undertaken to determine which exercise and radionuclide ventriculographic variables predict prognosis in advanced heart failure. Background. Although cardiopulmonary exercise testing is frequently used to predict prognosis in patients with advanced hear t failure, little is known about the prognostic significance of ventri culographic variables. Methods. The results of maximal symptom-limited cardiopulmonary exercise testing and first pass radionuclide ventricu lography in patients with advanced heart failure referred for evalu ti on for cardiac transplantation were analyzed. Results. Sixty seven pat ients with advanced heart failure (mean [+/-SD]; age 51 +/- 10 years, New York Heart Association functional classes III (58%) and IV (18%); mean left ventricular ejection fraction 0.22 +/- 0.07) underwent simul taneous upright bicycle ergometric cardiopulmonary exercise testing an d first-pass rest/exercise radionuclide ventriculography. Mean peak ox ygen consumption (Vo(2)) was 11.8 +/- 4.2 ml/kg per min, and mean peak age- and gender-adjusted percent predicted oxygen consumption (%Vo(2) ) was 38 +/- 11.9%. Univariate predictors of overall survival included right ventricular ejection fraction greater than or equal to 0.35 at rest and greater than or equal to 0.35 at exercise and %Vo(2), greater than or equal to 45% (all p < 0.05). In a multivariate proportional h azards survival model, right ventricular ejection fraction greater tha n or equal to 0.35 at exercise (p < 0.01) and %Vo(2) greater than or e qual to 45% (p = 0.01) were selected as independent predictors of over all survival. Univariate predictors of event-free survival included ri ght ventricular ejection fraction greater than or equal to 0.35 at res t (p = 0,01) and greater than or equal to 0.35 at exercise (p < 0.01), functional class II (p < 0.05) and %Vo(2) greater than or equal to 45 % (p = 0.05). Right ventricular ejection fraction greater than or equa l to 0.35 at exercise (p = 0.01) was the only independent predictor of event-free survival in a multivariate proportional hazards model. Car diac index at rest, Vo(2), left ventricular ejection fraction at rest, and exercise-related increase or decrease >0.05 in left or right vent ricular ejection fraction were not predictive of overall or event-free survival in any univariate or multivariate analysis. Conclusions. 1) Right ventricular ejection fraction greater than or equal to 0.35 at r est and exercise is a more potent predictor of survival in advanced he art failure than Vo(2) or %Vo(2); 2) %Vo, rather than Vo(2) predicts s urvival in advanced heart failure; 3) neither %Vo(2) nor Vo(2) predict s survival to the combined end point of death or admission for inotrop ic or mechanical support in patients with advanced heart failure.